x = int(input())
print('Yes' if x>= 30 else 'No') x = int(input()) x int(input()) int input() input print('Yes' if x>= 30 else 'No') print 'Yes' if x>= 30 else 'No' x>= 30 x 30 'Yes' 'No' x = int(input()) int(input()) x
x = int(input())
print('Yes' if x>= 30 else 'No')
